CN202410497U - Flue gas denitration device of cement kiln - Google Patents
Flue gas denitration device of cement kiln Download PDFInfo
- Publication number
- CN202410497U CN202410497U CN2011205044188U CN201120504418U CN202410497U CN 202410497 U CN202410497 U CN 202410497U CN 2011205044188 U CN2011205044188 U CN 2011205044188U CN 201120504418 U CN201120504418 U CN 201120504418U CN 202410497 U CN202410497 U CN 202410497U
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- Prior art keywords
- flue gas
- cement
- kiln
- reducing agent
- denitration
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/54—Nitrogen compounds
- B01D53/56—Nitrogen oxides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2062—Ammonia
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0233—Other waste gases from cement factories
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- Environmental & Geological Engineering (AREA)
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- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
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Abstract
The utility model discloses a flue gas denitration device of a cement kiln, which comprises a cement decomposition kiln, a preboiler, a humidification tower, a dust remover and an SCR reactor, wherein the cement decomposition kiln, the humidification tower and a dust removal system are sequentially connected, the SCR reactor is mounted below the humidification tower or the dust removal system, and a reducing agent spray gun is arranged inside the chimney flue at the tail part of the cement decomposition kiln. A reducing agent spray gun is arranged at a one second part of the flue gas pipeline, and a shrinking and diffusing passage is arranged behind the flue gas pipeline. In the utility model, an SCR denitration system is added at the tail part of the system, so that ammonia escape rate in an SNCR system is lowered, meanwhile, through the SNCR preliminary denitration at the front end, the volume of the SCR reactor and the use level of catalyst are reduced, one-time investment cost for the denitration system can be reduced, and the denitration efficiency of the system is improved. The flue gas denitration device provided by the utility model is suitable for desorbing nitrogen oxides in flue gas of the cement kiln and has a wide market and application prospect.
Description
Technical field
The utility model relates to the cement kiln control technology that discharges pollutants, and relates in particular to a kind of cement kiln equipment for denitrifying flue gas that efficiently removes nitrogen oxide under given conditions.
Background technology
Nitrogen oxide is the object of the strict control discharging of country after sulfur dioxide as one of main atmosphere pollution.The total amount of China's discharged nitrous oxides is about 1624.5 ten thousand tons at present, and wherein cement kiln discharges about 1,600,000 tons, accounts for about 1/10th of total release.Present most widely used gas denitrifying technology is SCR technology and SNCR technology, and SCR technology denitration efficiency can reach more than 95%, but because its investment is big, system complex, catalyst life is short, and operating cost is high, and is not suitable for the cement kiln of low temperature low-sulfur.Though and that SNCR technology is invested is low, operating cost is few, and system is simple, and is applied widely, and its fatal defective is exactly that denitration efficiency is low, and 30%-50% is only arranged, and far can not reach emission standards.
Having only the patent No. at present is the method that 201010130558.3 Chinese invention patent application relates to SCR and SNCR combined denitration.This patent application utilizes 5%～10% urea or ammoniacal liquor as reducing agent, sprays into temperature and be 600 ℃～900 ℃ fire coal boiler fume passage, and the selective non-catalytic reaction tentatively takes place; The flue gas temperature of flowing through is 260 ℃～400 ℃ a SCR reactor afterwards, and at catalyst surface generation selective catalytic reduction reaction, can make concentration is 350mg/m
3, 400mg/m
3NO be reduced to 35mg/m respectively
3, 40mg/m
3, the escape concentration of ammonia is controlled at below the 5ppm simultaneously.Though above-mentioned patent application denitration efficiency is very high, its SCR denitration section also belongs to high temperature section, can only be applicable to coal-burning boiler, and the gas componant of processing contains more SO
2, can cause catalysqt deactivation, shortened the service life of catalyst, increased operating cost greatly; The secondary denitration after cement kiln conditioning Tower or dust pelletizing system of this patent and inapplicable low temperature.
Summary of the invention
For the problem that technical background exists, the problem that the utility model will solve provides a kind of device that is used for the cement kiln denitrating flue gas, efficiently to remove nitrogen oxide under given conditions.
A kind of cement kiln equipment for denitrifying flue gas; Comprise that cement decomposes kiln, waste heat boiler, conditioning Tower, deduster and SCR reactor; Described cement decomposition kiln, waste heat boiler, conditioning Tower, dust pelletizing system connect successively; Described SCR reactor is installed in after conditioning Tower or the dust pelletizing system, and the back-end ductwork that described cement decomposes kiln is provided with the reducing agent spray gun, and described reducing agent spray gun preferably is arranged on 1/2nd places of flue; Arrange and shrink diffusion admittance, be beneficial to gas and mix diffusion thereafter.
The preferred honeycomb fashion reactor of described SCR reactor.
Described SCR reactor is not installed the equipment of ammonia-spraying grid or other spray reducing agents, and the mixing of reducing agent is controlled through the reducing agent spray gun that leading portion cement decomposes in the kiln back-end ductwork with allotment.
The running of above-mentioned cement kiln equipment for denitrifying flue gas may further comprise the steps:
(1) reducing agent being sprayed into temperature is to mix in 750 ℃～1100 ℃ the cement kiln flue gas, and the nitrogen oxide generation SNCR reaction in the mixed process in reducing agent and the flue gas makes it major part and is reduced to N
2Described reducing agent is one or more in liquefied ammonia, ammoniacal liquor or the urea.The preferred 10m/s-20m/s of the speed that sprays into of described reducing agent.The described reducing agent amount of spraying into is the NH in the reducing agent
3With the NO in the flue gas
XMol ratio be 1.1: 1～2.5: 1.
(2) reducing agent and the nitrogen oxide that is not reduced get into the SCR reactor after cooling, humidification, dedusting, on the surface of SCR catalyst selective catalytic reduction reaction take place; Most nitrogen oxide in the flue gas are reduced to N
2, the denitration rate can reach more than 90%, and the escaping of ammonia rate can be controlled in below the 3ppm simultaneously.The flue-gas temperature of described entering SCR reactor is 85 ℃～400 ℃.
Employed catalyst is for having the alkali-metal middle low temperature high activity composition of alkali resistant soil; It is shaped as cellular; Carrier is the combination of titanium dioxide or titanium dioxide and alundum (Al; In the catalyst gross mass is 100%, and described SCR activity of such catalysts composition comprises following component by mass percent:
Surplus is a carrier.
The utility model device and existing compared with techniques have following advantage:
1, with respect to the SNCR technology, the utility model has improved denitration efficiency greatly;
2, with respect to the SCR technology, the utility model has reduced the escaping of ammonia rate, has also saved floor space simultaneously greatly, has shortened the construction period, has reduced the investment operation cost;
3, the utility model is applicable to the transformation of existing SCR denitrating system, and it is convenient to implement;
4, the utility model is applicable to cement kiln system afterbody low-temperature denitration of flue gas, meets national relevant controlling cement kiln NO
XThe environmental protection guiding of discharging has wide application space and huge market value.
Description of drawings
Fig. 1 is the utility model schematic representation of apparatus, wherein:
1-cement decomposes kiln; The 2-waste heat boiler; The 3-conditioning Tower; The 4-deduster; The 5-SCR reactor.
Fig. 2 is a spray gun and the local enlarged diagram that shrinks diffusion admittance in the utility model device, wherein:
The 6-spray gun; 7-shrinks diffusion admittance.
The specific embodiment
Cement kiln equipment for denitrifying flue gas as shown in Figure 1; Comprise that the cement that connects successively decomposes kiln 1, waste heat boiler 2, conditioning Tower 3, deduster 4 and SCR reactor 5; Described SCR reactor is the honeycomb fashion reactor, is 750 ℃～1100 ℃ in temperature range, and nitrous oxides concentration is 600mg/m
3Cement back-end ductwork 1/2nd places that decompose kiln 1 arrange spray gun; Arrange behind the spray gun and shrink diffusion admittance (as shown in Figure 2); According to the mole ratio of nitrogen oxide in the straying quatity of reducing agent and the flue gas is that 2.0: 1 amount sprays into reducing agent, and the speed of spraying into is 15m/s.Reducing agent mixes with flue gas in flue, and reacts with nitrogen oxide generation selective non-catalytic, with most of NO
XBe reduced into N
2
In temperature is that deduster 4 afterbody places about 95 ℃ arrange the SCR reactor, be mounted with cellular, have alkali resistant soil alkali-metal in low temperature high activity catalyst, its active component mainly comprises: 8.5% WO
3, 3.6% MoO
3, 2.9%V
2O
5, 2.8% ZrO
2, 4.2% MnO
2, 3.3% Ce
2O
3, the mentioned component mixed carrier is after do to mix, kneading, pugging, extrude, make moulding after drying and the roasting.Reducing agent and nitrogen oxide are realized the secondary denitration at catalyst surface generation selective catalytic reduction reaction, and denitration efficiency can reach 91.7%; The concentration of SCR reactor outlet nitrogen oxide is 50mg/m
3Below, the escaping of ammonia concentration is about 3ppm.
Embodiment 2
A kind of cement kiln equipment for denitrifying flue gas comprises that cement decomposes kiln 1, waste heat boiler 2, conditioning Tower 3, deduster 4 and SCR reactor 5, and different with embodiment 1 is that described SCR reactor 5 is installed between conditioning Tower 3 and the deduster 4.
In temperature range is 750 ℃～1100 ℃, and nitrous oxides concentration is 600mg/m
3Cement back-end ductwork 1/2nd places that decompose kiln 1 arrange spray gun 6, be that 2.4: 1 amount sprays into reducing agent according to the mole ratio of nitrogen oxide in the straying quatity of reducing agent and the flue gas, the speed of spraying into is 15m/s.Reducing agent mixes with flue gas in flue, and reacts with nitrogen oxide generation selective non-catalytic, with most of NO
XBe reduced into N
2
In temperature is that conditioning Tower 3 afterbody places about 160 ℃ arrange SCR reactor 5, be mounted with cellular, have alkali resistant soil alkali-metal in low temperature high activity catalyst, its active component mainly comprises: 8.5% WO
3, 3.6% MoO
3, 2.9%V
2O
5, 2.8% ZrO
2, 4.2% MnO
2, 3.3% Ce
2O
3, the mentioned component mixed carrier is after do to mix, kneading, pugging, extrude, make moulding after drying and the roasting.Reducing agent and nitrogen oxide are realized the secondary denitration at catalyst surface generation selective catalytic reduction reaction, and denitration efficiency can reach 91%; The concentration of SCR reactor outlet nitrogen oxide is 55mg/m
3Below, the escaping of ammonia concentration is about 3ppm.
A kind of cement kiln equipment for denitrifying flue gas, apparatus arrangement is identical with embodiment 2, is 750 ℃～1100 ℃ in temperature range, and nitrous oxides concentration is 550mg/m
3Cement decompose kiln 1 back-end ductwork 1/2nd places and arrange spray gun, be that 2.0: 1 amount sprays into reducing agent according to the mole ratio of nitrogen oxide in the straying quatity of reducing agent and the flue gas.Reducing agent mixes with flue gas in flue, and reacts with nitrogen oxide generation selective non-catalytic, with most of NO
XBe reduced into N
2
In temperature is that conditioning Tower 3 afterbody places about 160 ℃ arrange SCR reactor 5, be mounted with cellular, have alkali resistant soil alkali-metal in low temperature high activity catalyst, its active component mainly comprises: 8.5% WO
3, 3.6% MoO
3, 2.9%V
2O
5, 2.8% ZrO
2, 4.2% MnO
2, 3.3% Ce
2O
3, the mentioned component mixed carrier is after do to mix, kneading, pugging, extrude, make moulding after drying and the roasting.Reducing agent and nitrogen oxide are realized the secondary denitration at catalyst surface generation selective catalytic reduction reaction, and denitration efficiency can reach 91.8%; The concentration of SCR reactor outlet nitrogen oxide is 45mg/m
3Below, the escaping of ammonia concentration is about 3ppm.
A kind of cement kiln equipment for denitrifying flue gas, apparatus arrangement is identical with embodiment 1, is 750 ℃～1100 ℃ in temperature range, and nitrous oxides concentration is 550mg/m
3Cement decompose kiln 1 back-end ductwork 1/2nd places and arrange spray gun, be that 1.5: 1 amount sprays into reducing agent according to the mole ratio of nitrogen oxide in the straying quatity of reducing agent and the flue gas.Reducing agent mixes with flue gas in flue, and reacts with nitrogen oxide generation selective non-catalytic, with most of NO
XBe reduced into N
2
In temperature is that deduster 4 afterbody places about 95 ℃ arrange SCR reactor 5, be mounted with cellular, have alkali resistant soil alkali-metal in low temperature high activity catalyst, its active component mainly comprises: 8.5% WO
3, 3.6% MoO
3, 2.9%V
2O
5, 2.8% ZrO
2, 4.2% MnO
2, 3.3% Ce
2O
3, the mentioned component mixed carrier is after do to mix, kneading, pugging, extrude, make moulding after drying and the roasting.Reducing agent and nitrogen oxide are realized the secondary denitration at catalyst surface generation selective catalytic reduction reaction, and denitration efficiency can reach 91.8%; The concentration of SCR reactor outlet nitrogen oxide is 45mg/m
3Below, the escaping of ammonia concentration is about 3ppm.
Claims (3)
1. cement kiln equipment for denitrifying flue gas; Comprise that cement decomposes kiln, preboiler, conditioning Tower, deduster and SCR reactor; It is characterized in that: described cement decomposition kiln, conditioning Tower, dust pelletizing system connect successively; Described SCR reactor is installed in after conditioning Tower or the dust pelletizing system, is provided with the reducing agent spray gun in the back-end ductwork of described cement decomposition kiln.
2. denitrification apparatus according to claim 1 is characterized in that: described reducing agent spray gun is arranged on 1/2nd places of flue, arranges thereafter and shrinks diffusion admittance.
3. denitrification apparatus according to claim 1 is characterized in that: described SCR reactor is the honeycomb fashion reactor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205044188U CN202410497U (en) | 2011-12-07 | 2011-12-07 | Flue gas denitration device of cement kiln |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205044188U CN202410497U (en) | 2011-12-07 | 2011-12-07 | Flue gas denitration device of cement kiln |
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| Publication Number | Publication Date |
|---|---|
| CN202410497U true CN202410497U (en) | 2012-09-05 |
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|---|---|---|---|
| CN2011205044188U Expired - Fee Related CN202410497U (en) | 2011-12-07 | 2011-12-07 | Flue gas denitration device of cement kiln |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102512925A (en) * | 2011-12-07 | 2012-06-27 | 浙江天蓝环保技术股份有限公司 | Denitration process and denitration apparatus for cement kiln flue gas |
| CN103406006A (en) * | 2013-08-30 | 2013-11-27 | 安徽省元琛环保科技有限公司 | SCR (Selective Catalytic Reduction) denitration device for NOx control of rotary cement kiln |
| CN106457142A (en) * | 2014-04-12 | 2017-02-22 | Khd洪保德韦达克有限公司 | Method and system for the denitrification of flue gases by means of SNCR (selective non-catalytic reduction) and downstream catalyst for ammonia decomposition |
| CN108554144A (en) * | 2018-06-07 | 2018-09-21 | 中国科学院过程工程研究所 | A kind of SCR denitration system suitable for the high-alkali flue gas of the high dirt of cement kiln tail |
| CN111672294A (en) * | 2020-07-07 | 2020-09-18 | 天津水泥工业设计研究院有限公司 | Bypass air-discharging purification system and method for cement kiln |
-
2011
- 2011-12-07 CN CN2011205044188U patent/CN202410497U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102512925A (en) * | 2011-12-07 | 2012-06-27 | 浙江天蓝环保技术股份有限公司 | Denitration process and denitration apparatus for cement kiln flue gas |
| CN102512925B (en) * | 2011-12-07 | 2014-03-12 | 浙江天蓝环保技术股份有限公司 | Denitration process and denitration apparatus for cement kiln flue gas |
| CN103406006A (en) * | 2013-08-30 | 2013-11-27 | 安徽省元琛环保科技有限公司 | SCR (Selective Catalytic Reduction) denitration device for NOx control of rotary cement kiln |
| CN106457142A (en) * | 2014-04-12 | 2017-02-22 | Khd洪保德韦达克有限公司 | Method and system for the denitrification of flue gases by means of SNCR (selective non-catalytic reduction) and downstream catalyst for ammonia decomposition |
| EP3131659A1 (en) * | 2014-04-12 | 2017-02-22 | KHD Humboldt Wedag GmbH | Method and system for the denitrification of flue gases by means of sncr (selective non-catalytic reduction) and downstream catalyst for ammonia decomposition |
| CN108554144A (en) * | 2018-06-07 | 2018-09-21 | 中国科学院过程工程研究所 | A kind of SCR denitration system suitable for the high-alkali flue gas of the high dirt of cement kiln tail |
| CN111672294A (en) * | 2020-07-07 | 2020-09-18 | 天津水泥工业设计研究院有限公司 | Bypass air-discharging purification system and method for cement kiln |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120905 Termination date: 20171207 |